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M256 Downpipe
Purchase M256 Downpipe
  • SKU: 01-256-02098-3

    M256 Downpipe

  • Advertised gains are estimates of HP and Torque “at the engine” calculated from gains as measured on a Dynojet Dynamometer in ideal conditions and typically show the largest possible change.  Actual gains are dependent on the following: Learn More about Crank HP Vs Wheel HP

    Model – Manufacturers use the same engine in multiple model vehicles and often times they are in a different state of tune, for example: 2008 C63 and a 2008 CLK Black Series.  Both have the same engine, but the C63 has 451hp while the CLK63 has 500hp.  Naturally the C63 will show more gains as it starts at a lower level.

    Model Year – Similar to above, as time progresses, Manufacturers tend to slightly increase power output via software from one year to the next or offer “Performance Packages” with increased power.  The engines remain largely unaltered and as a result, final tuned output remains the same, while the gains are lower as the starting point is now higher.

    Fuel – Fuel quality is HIGHLY important with performance vehicles.  Low quality and/or low octane fuel will greatly impact engine output and potentially even engine health.  Top tier brand premium fuels should always be used to achieve the best results possible.

    Drivetrain – All wheel drive has higher drivetrain losses than rear wheel drive.  This results in lower numbers when testing on a chassis dyno.  Wheel/tire size and weight will also impact chassis dyno results

    Weather/Conditions – Temperature, humidity, altitude, and air density all impact engine performance.  Heat, high humidity, and thin air will all work towards reducing engine output

    Engine Health – Higher miles tends to result in increased build up and lower compression which can and will impact engine output.  Properly maintained engines will have better performance than abused or neglected engines.

    Supporting modifications – The highest power levels require supporting modifications.  Depending on the engine, this could mean forged internals, built transmission, upgraded fuel system, 110+ octane race fuel, etc.

  • $1,349.00 $1,349.00

  • Prop 65 warning

    This product can expose you to chemicals including carbon black, silica - crystalline, formaldehyde, and lead which are known to the State of California to cause cancer, and lead, which is known to the State of California to cause birth defects or other reproductive harm. For more information go to

Weistec Horsepower 555
Weistec Torque 581
Manufacturer Weistec
Street legal in all the US States No
Engine Family M256
Stock Horsepower 497
See more
year make model trim engine
2020 Mercedes-Benz GLE53 AMG 4MATIC (V167) Turbocharged 3L I6 (M256)
2020 Mercedes-Benz CLS53 AMG 4MATIC (C257) Turbocharged 3L I6 (M256)
2019 Mercedes-Benz CLS53 AMG 4MATIC (C257) Turbocharged 3L I6 (M256)
2018 Mercedes-Benz CLS53 AMG 4MATIC (C257) Turbocharged 3L I6 (M256)
2020 Mercedes-Benz E53 AMG 4MATIC (W213) Turbocharged 3L I6 (M256)
2019 Mercedes-Benz E53 AMG 4MATIC (W213) Turbocharged 3L I6 (M256)
See more

Product Description

*Please allow 4 weeks for orders to be shipped. Downpipes are made to order.

[ Needs ECU Tuning to run properly ]

Weistec Engineering offers the M256 Downpipe for the Mercedes Benz 3.0L Turbocharged M256 equiped vehicles.  The downpipes were designed with the most sophisticated Computer Aided Design tools to ensure excellent fitment. The downpipe features 3 inch diameter piping and a laser cut precision flange to mate with factory mounting points, giving this system a perfect fit. Our M256 Downpipes features CNC Machined 304 stainless steel turbine flanges to mate with the turbos perfectly using the OEM clamp.  The M256 Downpipes mate to the rest of the exhaust using an OEM style adapter for a simple bolt in installation.

 *Product may not be emissions compliant. Check local laws prior to installation. 

Key Features:

  • 100% mandrel bent and TIG welded

  • Constructed of low carbon 304 Stainless Steel

  • CNC machined 304SS turbine flanges

  • Laser cut mounting brackets

  • Fully brushed finish

  • Bolt-on installation

  • 3 hour install time

  • 5-15hp Gains

  • Improved exhaust note

  • Improved exhaust flow

  • Improved turbo response